Apparatus for copying on light-sensitive surfaces



March 3, 1931. A. SYHRE 1,795,185

APPARATUS FOR COPYING ON LIGHT SENSITIVE SURFACES Filed May 24, 1929 6Sheets-Sheet l O Q O 05 5 an FL foo 0&1 Y

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March 3, 1931. A. SYHRE Filed May 24, 1929 6 Sheets-Sheet 3 Fly. 3.

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March 3, 1931. A. SYHRE 1,795,185

APPARATUS FOR COPYING ON LIGHT SENSITIVE SURFACES Filed May 24, 1929 6Sheets-Sheet 4 Inventor.-

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March 3, 1931. sYHRE 1,795,185

APPARATUS FOR COPYING ON LIGHT SENSITIVE SURFACES Filed May 24, 1929 6Sheets-Sheet 5 Fly. 8.

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March 3, 1931. A. sYHRE 1,795,185

APPARATUS FOR COPYING ON LIGHT SENSITIVE SURFACES Filed May 24, 1929 6Sheets-Sheet 6 Inventor:

Patented Mar. 3, 1931 UNITED STATES PATENT OFFICE.

AKTIENGESELL- SCHAIT, OELEIPZIG, GERMANY, A COMPANY OF GERMANY APPARATUSFOR COPYING ON LIGHT-SENSITIVE SURFACES Application filed Kay 24, 1929,Serial No. 365,605,

The invention relates to apparatus for copying on light-sensitivesurfaces, generally from a negative on to a stone or metal printingplate, the apparatus being of the kind in which the holder of thenegative is carried by a frame laterally movable in one direction on orin a frame which is laterally movable in the direction perpendicular tothe movement of the first mentioned frame.

According to our invention the holder of the negative is movableperpendicularly to the plane of movement of the frame which carries it.

An example of apparatus according to the invention is illustrated in theannexed drawings.

Fig. 1 is a front view thereof, and

Fig. 2 is a side view,

Fig. 3 being a plan view, holder removed, and

Fig. 4 is a vertical section.

Fig. 5 is a view of the meter and its actuating mechanism.

Fig. 6 is a side elevation of parts shown in Fig. 8.

Fig. Fig. 8.

Fig. Sis a cross-section through one side of the holder carrying frameand the holder.

Fig. 9 is a top plan view of the holder and means for mounting it on theholder carryin frame.

iig. 10 is a cross-section through the parts shown in Fig. 9.

with the lamp 7 is a top plan view of parts shown in In the drawings 1represents a table for the p printing plate to be exposed, the tablebeing vertically movable between guides 2 on a be 3. Around the tablethere is a frame 4, and above it a frame 5, these frames being movableperpendicularly to each other. Above the frame 5 which supports thenegative, is a lam holder 6, which can be moved aside.

Owlng to the table 1 being vertically movable, instead of the lampholder, the guides 2 enabling the vertical adjustment to be made arewell removed from the lamp, and consequently are not liable to becomeoverheated. Moreover, being spaced well apart, the guides afiord veryaccurate guidance. Another advantage of making the table vertically movdthe frame 5 from above,

and in Germany October 11, 19271 able, instead of the lamp, is thatmetal printmg plates and stone can be dealt with alternatively.

The table 1 is raised and lowered by means of a hand wheel 7 actuatingworm gears 8 and 9 and bell crank levers 10. Springs 11 take part of theload on the bell crank levers, the stress on the springs being less,when the table is raised for metal plates, than when the table islowered for the heavier stones.

Within the frame 5 there is a holder 12 for the negative, the holderhaving slotted brackets 13 which engage vertical flanges 14 on theframe. The flanges 14 have slots 15 extendmg downwards from the top, sothat the upper parts thereof are resilient. The holder engaged with theflanges is not movable laterally, but can be raised and lowered, and canalso, by virtue of the resilience of the flanges, be slightly tilted,should that be necessary, by reason of some inequality of thickness, toenable the negative to lie evenly'on the printing plate. There is a gap16 between the frame 5 and the holder 12.

Within the holder 12 is a frame 17, in which the glass plate 18 isfixed. The frame 17 can be adjusted horizontally in the holder 12 in alldirections, by means of cams 19, and fixed by means'of binding screw 20.Instead of cams we may use set screws or any other convenient means foradjusting the frame 17. The horizontal adjustability of the frame 17 inthe holder 12 (the latter being horizontally immovable in the frame 5,enables the icture to be very accurately centred. The holder 12, withthe negative, is inserted into the lamp holder 6 being moved aside forthis purpose. The fact that the lamp holder can be moved aside enablesthe negative to be inspected at any time Without removing it from theframe.

After insertion of the holder 12 a hinged frame 21 is folded down overit, and fastened by means of a bayonet catch 22, this frame 21 havingsprings 23 which bear upon the holder 12, or against which the holder 12is pressed when the table 1, with the plate upon it, is raised intocontact with the negative. A meter 24 at the hub of the hand wheel 7indicates when the lifting of the table has be gun to exert pressure onthe holder 12 and contact between the negative and the plate has beenobtained. It also indicates the strength of the pressure. The meterwithin the hand wheel is very easy to observe while manipulating thetable. The meter 24 is actuated by means of a stud 25 (Fig. 5) which ismounted in the frame 5 and is vertically movable. After insertion of theholder 12 into the frame 5 this stud is rotated so that an eccentricortion thereof engages over the holder. 6n the holder being raised bythe lifting of the table the stud is also raised. together with abracket 26 connected by a link 27 to a small bell crank lever 28, whichit rocks, thus actuating by means of a rod 29 a double armed lever 30connected by a rod 31 to the meter 24.

What I claim is:

1. In an apparatus for printing from a negative upon a printing plate,the combination of a stationary main frame, a table carried thereby forsupporting the printing plate, a pair of adjustable frames arranged insu erposed relation above the table and adjusta le horizontally inplanes perpendicularly to each other, a lamp holder movable into and outof registry with the upper adj ustable frame, a negative holder mountedfor vertical and unilateral tilting ad'ustment on the upper adjustableframe, an a negative carrying frame mounted in said holder.

2. In an apparatus for printing from a negative upon a printing plate,the combination of a stationary main frame, a table carried thereby forsupporting the printing plate, means for vertically adjusting saidtable, a pair of adjustable frames arranged in superposed relation abovethe table and adjustable horizontally in planes erpendicularly to eachother, a lamp holcliar movable into and out of registry with the upperadjustable frame, a negative holder mounted for vertical and unilateraltilting adjustments on the upper adjustable frame, and a negativecarrying frame mounted in said holder.

3. In an apparatus for printing from a negative upon a printing plate,the combinat on of a stationary main frame, a table carried thereby forsupporting the printing plate, means for vertically adjusting saidtable, means cooperating with the ad usting means for balancing theweight of the table, a pair of adjustable frames arranged in superposedrelation above the table and adjustable horizontally in planesperpendicularly to each other, a lamp holder movable nto and out ofregistry with the upper adustable frame, a negative holder mounted forvertical and unilateral tilting adjustments on the upper adjustableframe, and a negative carrying frame mounted in said holder.

4. In an apparatus for printing from a negative upon a printing plate,the combination of a stationary main frame, a table carried thereby forsupporting the printingplate, gearing including bell crank levers and aconnecting rod coupling the same for vertically adjustin the table, aspring acting on said rod for%)alancing the weight of the table, a pairof adjustable frames arranged in superposed relation above the table andadjustable horizontally in planes perpendicularly to each other, a lampholder movable into and out of registry with the upper adjustable frame,a negative holder mounted for vertical and unilateral tiltingadjustments on the upper adjustable frame, and a negative carrying framemounted in said holder.

5. In an apparatus for printing from a negative upon a printing plate,the combination of a stationary main frame, a table carried thereby forsupporting the printing plate, a pair of adjustable frames arranged insuperposed relation above the table and adjustble horizontally in planeserpendicularly to each other, a lamp hol er movable into and out ofregistry with the upper adjustable frame, resilient posts on the upperadjustable frame, a negative holder mounted for vertical and unilateraltilting adjustments on said posts, and a. negative carrying framemounted in said holder.

6. In an apparatus for printing from a negative upon a printing plate,the combination of a stationary main frame, a table carried thereby forsupportin the printing plate, a pair of adjustable rames arranged insuperposed relation above the table and adjustable horizontally inplanes perpendicularly to each other, a lamp holder movable into and outof registry with the upper adjustable frame, a negative holder carriedby the upper adjustable frame, a negative carrying frame mounted in saidholder, pressure means for exerting downward ressure on the holder andpermitting yiel ing upward movement thereof, means for verticallyadjusting the table and causing the printing plate carried thereby toexert upward pressure on the negative holder in opposition to thefirst-named pressure, and indicating means automaticaly operative forindicating the pressure exerted on the holder at any time.

7. In an apparatus for printing from a negative upon a printing late,the combination of a stationary main ame, a table carried thereb forsupporting the printing plate, a pair 0 adjustable frames arranged insuperposed relation above the table and adjustable orizontally in planesperpendicularly to each other, a lamp holder movable into and out ofregistry with the upper adjustable frame, a negative holder ounted forvertical and unilateral tilting a stments on the upper adjustable frame,a'negative carrying frame adjmtable horizontally in all four cardinaldirections on-the negative holder, and means for adjusting said negativecarrying frame.

8. In an apparatus for printing from a negative upon a printing plate,the combination of a stationary main frame, a. table carll(.(l therebyfor supporting the printing plate, -a pair of adjustable frames arrangedin superposed relation above the table and :ul]ll 't:|l)le horizontallyin planes perpendicularly to each other, a lamp holder movable.

into and out of registry with the upper adjustable frame. a negativeholder mounted for vertical and unilateral tilting adjust ments on theupper adjustable frame, a negative earuviug frame slidahly mounted foruniversal horizontal adjustment in said negative holder, and cam meansfor adjusting said negative carq ing'frame.

Iutestimony whereof I affix my signature.

ALFRED SYHRE.

